... and send allies for do close work for you. Then, take out master from safe distance,

How do you "send allies"? I'm on a PS2 in singleplayer mode.

Where would you go on the map to "take out masters from a safe distance"? They tend to move around a LOT and once I miss even once with my sniper rifle, they come charging at me with their saber block on (i.e., no more shots are getting through).